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Electro-dissolved ozone flotation (E-DOF) integrated anoxic/oxic membrane reactor for leachate treatment from a waste transfer station

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Abstract

With high organics and ammonia, leachate from waste transfer stations (WTSs) is among the most complex wastewater that cannot be easily disposed by signal biological processes. In this study, an electro-dissolved ozone flotation (E-DOF) was established, in which dissolved ozone flotation (DOF) and electro-coagulation (EC) occurred concurrently in one unit and integrated with anoxic/oxic membrane bioreactor (A/O-MBR) to dispose leachate from a WTS. In the integrated reactor, E-DOF acted as pretreatment and advanced treatment unit. A/O-MBR acted as secondary treatment unit. The E-DOF pretreatment achieved 34.48% COD and 16.96% NH3-N removal efficiency through synergistic effect between EC and DOF. BOD5/COD of leachate was increased from 0.32 to 0.51 after E-DOF pretreatment, indicating the enhancement of biodegradability. Molecular weight distribution (MWD) and three-dimensional excitation-emission matrix (3D-EEM) analysis demonstrate that the reduction of molecular weight and elimination of refractory organics through EC, ozone, and their interacted product (•OH) are attributed to biodegradability enhancement in lechate. Microbial community analysis proved that chemoheterotrophy and oxic chemoheterotrophy functions, mainly provided by Truepera, Aquamicrobium, Saprospiraceae, and Lentimicrobiaceae, ensured the efficient degradation of organic in the secondary processes. E-DOF advanced treatment effectively disposed residual contaminant in MBR effluent. The E-DOF advanced treatment mainly disposed residual contaminant in MBR effluent. High removal efficiency of COD (98.59 ± 0.27%), NH3-N (95.59 ± 0.50%), TN (95.37 ± 0.73%), and TP (96.75 ± 1.66%) were observed in the integrated reactor, and final effluent met the discharge standards for inclusion in the sewage pipe network in China.

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All data generated or analyzed during this study are included in this published article (and its supplementary information files).

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Funding

This work was supported by the National Science Foundation of China (No. 52070151, 52170052), the Key Research and Development Project of Shaanxi Province (2021ZDLSF05-06, 2019ZDLSF05-03), Technology Innovation Leading Program of Shaanxi (2020CGXNG-021), and the New Style Think Tank of Shaanxi Universities.

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Authors and Affiliations

  1. School of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology, No. 13, Yanta Road, Beilin District, Xi’an, 710055, Shaanxi Province, China

    Chao Yang, Lei Zhang, Shiyi Hu, Yue Diao, Pengkang Jin & Xiaochang C. Wang

  2. School of Human Settlements and Civil Engineering, Xi’an Jiaotong University, Xi’an, 710049, Shaanxi Province, China

    Xin Jin & Pengkang Jin

  3. Jiang Su Yong Guan Water and Wastewater Equipment Co. Ltd, Jiangsu Province, Xu’zhou, 221100, China

    Chong Chen & Xia Wu

Authors
  1. Chao Yang
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  2. Lei Zhang
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  3. Shiyi Hu
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  4. Yue Diao
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  5. Xin Jin
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  6. Pengkang Jin
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  7. Chong Chen
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  8. Xia Wu
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  9. Xiaochang C. Wang
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Contributions

All authors contributed to the study conception and design. Formulation or evolution of overarching research goals and aims were established by Jin Pengkang. Material preparation, data collection, and analysis were performed by Lei Zhang, Shiyi Hu, and Xin Jin. Equipment processing was accomplished by Chong Chen and Xia Wu. The first draft of the manuscript was written by Yang Chao, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Pengkang Jin.

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Yang, C., Zhang, L., Hu, S. et al. Electro-dissolved ozone flotation (E-DOF) integrated anoxic/oxic membrane reactor for leachate treatment from a waste transfer station. Environ Sci Pollut Res 29, 55803–55815 (2022). https://doi.org/10.1007/s11356-022-19526-y

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